AI-generatedTrondheim at a glance
- Best time
- Jun – Aug
- Warmest month
- Jul · 19°
- Warmest sea
- Aug · 13.7°
- Sunshine a year
- 1,570 h
- Rain a year
- 1,081 mm
- Climate
- Continental
- Time zone
- UTC+1 / UTC+2
- Elevation
- 18 m
Climate in Trondheim
Trondheim has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 19 °C, while January is the coolest at −1 °C. With around 1,570 hours of sunshine a year, Trondheim is rather dull; May is the sunniest month with 7.7 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: June – August
Keep in mindFrequent rain
A typical day in October
- Morning, 08:00: about 3°
- Midday, 13:00: about 8°
- Afternoon, 16:00: about 8°
- Evening, 20:00: about 6°
- Night, 23:00: about 4°
08:0318:05
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:34–09:11 · evening 16:57–18:34
- Blue hour
- Morning 07:16–07:34 · evening 18:34–18:52
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Trondheim in October?
In October, Trondheim is cold: daytime highs average 8 °C, and nights cool down to about 2 °C. The sea averages 11.0 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. It rains often – on about 16 days, adding up to 95 mm. Snow falls on about 2 days. All in all, October is not an ideal month for a holiday in Trondheim.
More details for October
- Daylight
- 10 h 1 min08:03 – 18:05
- UV index
- 1 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 13 km/haverage daily peakAll months
- Cloud cover
- 74 %on averageAll months
- Hot days
- 0 days30 °C or more
- Snow days
- 2 days1 cm or more of fresh snowAll months
- Time zone
- UTC+2Europe/Oslo
How the score comes together
- Temperatureweight 50 %2 %
- Sunshineweight 20 %2 %
- Few rainy daysweight 30 %14 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Warm jacket
- Rain jacket or umbrella
Sea temperature in Trondheim
Monthly sea surface temperature with the range of cooler and warmer years.
8 in 10 years: 10.0 – 12.0 °C
Swimming season: Never above 20 °C
- cold
- fresh
- refreshing
- pleasant
- warm
- very warm
The sea temperature in Trondheim ranges from 5.5 °C in March to 13.7 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
The sea warms up slowly: it is warmest in August, while the air already peaks in July. From October to March the sea is even warmer than the afternoon air. The sea temperature varies from year to year: in August, eight out of ten years were between 12.5 and 15.0 °C.
| Month | Average | Cool year | Warm year | Feels |
|---|---|---|---|---|
| JanuaryJan | 6.1° | 5.4° | 6.9° | cold |
| FebruaryFeb | 5.6° | 4.7° | 6.2° | cold |
| MarchMar | 5.5° | 5.0° | 6.1° | cold |
| AprilApr | 6.3° | 5.4° | 6.9° | cold |
| MayMay | 8.1° | 7.4° | 8.7° | cold |
| JuneJun | 10.7° | 9.5° | 11.8° | cold |
| JulyJul | 13.0° | 11.6° | 14.5° | cold |
| AugustAug | 13.7° | 12.5° | 15.0° | cold |
| SeptemberSep | 12.8° | 11.8° | 13.7° | cold |
| OctoberOct | 11.0° | 10.0° | 12.0° | cold |
| NovemberNov | 8.9° | 7.8° | 9.8° | cold |
| DecemberDec | 7.3° | 6.3° | 8.4° | cold |
Sunshine hours in Trondheim
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.1 of 10.0 hours of daylight in Trondheim, 31 % of the day.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Trondheim
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 1 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 5).
Minutes until sunburn in October
- Very fair skin
- over 2 h
- Fair skin
- over 2 h
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Trondheim: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Trondheim has about 16 rainy days with 95 mm of rain in total.
Wind and clouds in Trondheim
How breezy and how cloudy Trondheim is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Trondheim typically peaks at 13 km/h during the day: Beaufort 3, light breeze.
Breezy months for windsurfing and kiting
The daily breeze rarely reaches Beaufort 4 (20 km/h), so wind sports depend on single windy days.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 74 % of the sky over Trondheim: mostly cloudy, with about 3.1 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Snow in Trondheim
When Trondheim is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, Trondheim has about 2 days with at least 1 cm of fresh snow, 5 cm in total. The chance of seeing snow during a week's stay is 20 out of 100: possible.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Trondheim
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
ColdOctober: nights around 2°. The room should be heated.
The coolest nights are in January (−7°), the warmest in July (11°). Nights fall below 8 °C on average from October to May, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sea | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|---|
| JanuaryJan | 4 | −1° | −7° | 6.1° | 1.0 h | 16 | 95 |
| FebruaryFeb | 7 | 0° | −6° | 5.6° | 2.5 h | 15 | 85 |
| MarchMar | 9 | 3° | −4° | 5.5° | 4.4 h | 16 | 96 |
| AprilApr | 20 | 8° | 0° | 6.3° | 6.5 h | 14 | 70 |
| MayMay | 46 | 13° | 4° | 8.1° | 7.7 h | 15 | 71 |
| JuneJun | 61 | 16° | 8° | 10.7° | 6.9 h | 15 | 94 |
| JulyJul | 68 | 19° | 11° | 13.0° | 6.8 h | 15 | 89 |
| AugustAug | 66 | 18° | 11° | 13.7° | 6.1 h | 15 | 102 |
| SeptemberSep | 43 | 14° | 8° | 12.8° | 4.5 h | 15 | 106 |
| OctoberOct | 6 | 8° | 2° | 11.0° | 3.1 h | 16 | 95 |
| NovemberNov | 11 | 2° | −2° | 8.9° | 1.5 h | 13 | 83 |
| DecemberDec | 6 | −1° | −6° | 7.3° | 0.5 h | 15 | 96 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
63.43° N, 10.40° E · 18 m · Europe/Oslo
Best time to visit Trondheim
The best time to visit Trondheim is from June to August. The sea stays too cool for a classic beach holiday: even in August it only reaches 13.7 °C. The wettest month is September with 106 mm of precipitation.
Trondheim through the seasons
How the weather changes over the seasons, with averages for each.
Trondheim in spring
Mar – May
Poor
- 3–13 °C by day
- Sea 7 °C
- 6 h of sun a day
- 46 rainy days in all
Trondheim in summer
Jun – Aug
Good
- 16–19 °C by day
- Sea 13 °C
- 7 h of sun a day
- 46 rainy days in all
Trondheim in autumn
Sep – Nov
Poor
- 2–14 °C by day
- Sea 11 °C
- 3 h of sun a day
- 44 rainy days in all
Trondheim in winter
Dec – Feb
Poor
- -1–0 °C by day
- Sea 6 °C
- 1 h of sun a day
- 46 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Trondheim for you.
Your best months: July – August
Based on the climate averages; tap a month to see its details.
Compare two months in Trondheim
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
July has the better holiday weather in Trondheim: score 68 against 6. In July, days are 11 °C warmer than in October. The sea is 2 °C warmer in July. July has one rainy day fewer. The sun shines 4 hours longer a day in July.
| Month | October | July |
|---|---|---|
| Weather score | 6 | 68better |
| Day high | 8° | 19° |
| Night low | 2° | 11° |
| Sea | 11.0° | 13.0° |
| Sunshine | 3.1 h | 6.8 hbetter |
| Rainy days | 16 | 15better |
| Rainfall | 95 mm | 89 mm |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No month
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
No month
15–28 °C and not too much rain
Rainy months
All year
12 or more rainy days
Snow
Nov – Apr
Snow on 2 or more days
Trondheim month by month
The typical weather for every month at a glance.
4January-1° · Sea 6° · 1 h
In January, Trondheim is freezing cold: daytime highs average −1 °C, and nights often drop below freezing (−7 °C). The sea averages 6.1 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 16 days, totalling 95 mm. Snow falls on about 11 days. All in all, January is not an ideal month for a holiday in Trondheim.
Trondheim in January7February0° · Sea 6° · 3 h
In February, Trondheim is freezing cold: daytime highs average 0 °C, and nights often drop below freezing (−6 °C). The sea averages 5.6 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. Precipitation, often as snow, falls on about 15 days, totalling 85 mm. Snow falls on about 10 days. All in all, February is not an ideal month for a holiday in Trondheim.
Trondheim in February9March3° · Sea 6° · 4 h
In March, Trondheim is cold: daytime highs average 3 °C, and nights often drop below freezing (−4 °C). The sea averages 5.5 °C – swimming is only for the hardy. Expect around 4 hours of sunshine a day. Precipitation, often as snow, falls on about 16 days, totalling 96 mm. Snow falls on about 9 days. All in all, March is not an ideal month for a holiday in Trondheim.
Trondheim in March20April8° · Sea 6° · 7 h
In April, Trondheim is cold: daytime highs average 8 °C, and nights often drop below freezing (0 °C). The sea averages 6.3 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. It rains often – on about 14 days, adding up to 70 mm. Snow falls on about 5 days. All in all, April is not an ideal month for a holiday in Trondheim.
Trondheim in April46May13° · Sea 8° · 8 h
In May, Trondheim is cool: daytime highs average 13 °C, and nights cool down to about 4 °C. The sea averages 8.1 °C – swimming is only for the hardy. The sun shines for around 8 hours a day. It rains often – on about 15 days, adding up to 71 mm. All in all, May is a so-so month for a holiday in Trondheim.
Trondheim in May61June16° · Sea 11° · 7 h
In June, Trondheim is mild: daytime highs average 16 °C, and nights cool down to about 8 °C. The sea averages 10.7 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. It rains often – on about 15 days, adding up to 94 mm. All in all, June is a good month for a holiday in Trondheim.
Trondheim in June68July19° · Sea 13° · 7 h
In July, Trondheim is mild: daytime highs average 19 °C, and nights cool down to about 11 °C. The sea averages 13.0 °C – swimming is only for the hardy. The sun shines for around 7 hours a day. It rains often – on about 15 days, adding up to 89 mm. All in all, July is a good month for a holiday in Trondheim.
Trondheim in July66August18° · Sea 14° · 6 h
In August, Trondheim is mild: daytime highs average 18 °C, and nights cool down to about 11 °C. The sea averages 13.7 °C – swimming is only for the hardy. Expect around 6 hours of sunshine a day. It rains often – on about 15 days, adding up to 102 mm. All in all, August is a good month for a holiday in Trondheim.
Trondheim in August43September14° · Sea 13° · 5 h
In September, Trondheim is cool: daytime highs average 14 °C, and nights cool down to about 8 °C. The sea averages 12.8 °C – swimming is only for the hardy. Expect around 5 hours of sunshine a day. It rains often – on about 15 days, adding up to 106 mm. All in all, September is a so-so month for a holiday in Trondheim.
Trondheim in September6October8° · Sea 11° · 3 h
In October, Trondheim is cold: daytime highs average 8 °C, and nights cool down to about 2 °C. The sea averages 11.0 °C – swimming is only for the hardy. The sun is scarce, with only about 3 hours a day. It rains often – on about 16 days, adding up to 95 mm. Snow falls on about 2 days. All in all, October is not an ideal month for a holiday in Trondheim.
Trondheim in October11November2° · Sea 9° · 2 h
In November, Trondheim is freezing cold: daytime highs average 2 °C, and nights often drop below freezing (−2 °C). The sea averages 8.9 °C – swimming is only for the hardy. The sun is scarce, with only about 2 hours a day. Precipitation, often as snow, falls on about 13 days, totalling 83 mm. Snow falls on about 6 days. All in all, November is not an ideal month for a holiday in Trondheim.
Trondheim in November6December-1° · Sea 7° · 1 h
In December, Trondheim is freezing cold: daytime highs average −1 °C, and nights often drop below freezing (−6 °C). The sea averages 7.3 °C – swimming is only for the hardy. The sun is scarce, with only about 1 hours a day. Precipitation, often as snow, falls on about 15 days, totalling 96 mm. Snow falls on about 9 days. All in all, December is not an ideal month for a holiday in Trondheim.
Trondheim in DecemberTrondheim compared
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Trondheim vs. Kristiansund Municipality
In October the holiday weather in Trondheim and Kristiansund Municipality is about equally good (score 6 vs. 5). During the day Kristiansund Municipality is 1 °C warmer than Trondheim. The sea in Kristiansund Municipality is 1 °C warmer.
| in October | Trondheim | Kristiansund Municipality |
|---|---|---|
| Holiday score | 6 | 5 |
| Daytime high | 8° | 9° |
| Sea | 11° | 12° |
| Sunshine | 3 h | 3 h |
| Rainy days | 16 | 18 |
| Best time | Jun – Aug | Apr – Jul |
Through the year
Norway in October: the best places
In October, Trondheim ranks 8 of 18 destinations in this country.
- Oslo9°12°20
- 2Lillehammer7°14
- 3Stavanger11°13°14
- 4Bergen10°13°12
- 5Kirkenes4°8°11
- 6Drammen10°12°10
- 7Fredrikstad Municipality10°12°9
- 8TrondheimThis page8°11°6
Planning a trip to Trondheim
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Trondheim in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Trondheim has its best school-holiday weather during the summer holidays (score 67) and its weakest during the Christmas holidays (score 5).
- 17
Easter holidays
Mar – Apr
Poor
- 6 °C by day
- Sea 6 °C
- 5.9 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain, Snow
- 49
May half-term
May – Jun
Fair
- 14 °C by day
- Sea 9 °C
- 7.5 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain
- 67
Summer holidays
Jul – Aug
GoodBest holidays
- 18 °C by day
- Sea 13 °C
- 6.3 h of sun a day
- 15 rainy days a month
Keep in mind: Frequent rain
- 6
October half-term
Oct
Poor
- 8 °C by day
- Sea 11 °C
- 3.1 h of sun a day
- 16 rainy days a month
Keep in mind: Frequent rain
- 5
Christmas holidays
Dec – Jan
Poor
- −1 °C by day
- Sea 7 °C
- 0.8 h of sun a day
- 16 rainy days a month
Keep in mind: Frequent rain, Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 2 h 15 min
- Distance
- 1,480 km
- Time zone
- UTC+2
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Trondheim
When is the best time to visit Trondheim?
The best time to visit Trondheim is from June to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
How warm is the sea in Trondheim?
The sea temperature in Trondheim ranges from 5.5 °C in March to 13.7 °C in August. Even at its warmest the sea stays below 20 °C, so swimming is bracing at best.
Can you swim in Trondheim in October?
Only if you don't mind cold water: in October the sea averages just 11.0 °C. Comfortable swimming temperatures are not reached at any time of year.
What is the warmest month in Trondheim?
July is the warmest month, with average highs of 19 °C and nights around 11 °C. January is the coolest month at −1 °C.
When does it rain most in Trondheim?
The wettest month is September with 106 mm of precipitation. The driest month is April with 70 mm.
How many hours of sunshine does Trondheim get?
Trondheim gets around 1,570 hours of sunshine a year. The sunniest month is May with 7.7 hours a day; in December there are 0.5 hours a day.
What time zone is Trondheim in?
Trondheim uses the time zone Europe/Oslo: UTC+1 in January and UTC+2 in July.
How long is the flight from London to Trondheim?
A nonstop flight from London to Trondheim takes about 2 h 15 min, for a straight-line distance of about 1,480 km.
Which school holidays are best for Trondheim?
Trondheim has its best school-holiday weather during the summer holidays (score 67) and its weakest during the Christmas holidays (score 5). Holiday ratings (0–100): Easter holidays 17, May half-term 49, Summer holidays 67, October half-term 6, Christmas holidays 5.
Near Trondheim
Other destinations close by.
Places with a climate like Trondheim
Destinations whose weather through the year is closest to Trondheim's – good alternatives.